OBD Guide
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C120C

Brake Pedal Position Sensor 4 Not Plausible

C120C is an OBD-II diagnostic trouble code meaning: Brake Pedal Position Sensor 4 Not Plausible. Common causes: malfunction of the brake pedal position sensor, open or shorted wiring harness. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Incorrect operation of ABS or ESP
  • Check Engine light comes on
  • Problems with cruise control

Causes

  • Malfunction of the brake pedal position sensor
  • Open or shorted wiring harness
  • Poor contact in the sensor connector
  • ECU malfunction

How to Fix

  1. Check the integrity of the wiring harness and connectors
  2. Check the resistance of the brake pedal position sensor
  3. Replace sensor if necessary
  4. Scan the system for other errors

Related codes

C120AC120BC120D

FAQ

What does the C120C code mean?

C120C is an OBD-II diagnostic trouble code that indicates: Brake Pedal Position Sensor 4 Not Plausible

What causes a C120C error code?

The most common causes of C120C include: Malfunction of the brake pedal position sensor; Open or shorted wiring harness; Poor contact in the sensor connector; ECU malfunction.

How do I fix a C120C diagnostic trouble code?

To fix C120C: Check the integrity of the wiring harness and connectors. Check the resistance of the brake pedal position sensor. Replace sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C120C?

Limited driving only, diagnose soon

How much does it cost to fix C120C?

The estimated repair cost for C120C is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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